Back in the 1980s, Sanders had some positive things to say about the former Soviet Union and the Sandinistas in Nicaragua.

Here he is explaining why the Cuban people didn't rise up and help the U.S. overthrow Cuban leader Fidel Castro: "…he educated their kids, gave them health care, totally transformed the society, you know?"

Bernie Sanders: We're very opposed to the authoritarian nature of Cuba but you know, it's unfair to simply say everything is bad. You know? When Fidel Castro came into office, you know what he did? He had a massive literacy program. Is that a bad thing? Even though Fidel Castro did it?

Anderson Cooper: A lot of p-- dissidents imprisoned in-- in Cuba.

Bernie Sanders: That's right. And we condemn that. Unlike Donald Trump, let's be clear, you want to-- I do not think that Kim Jong Un is a good friend. I don't trade love letters with a murdering dictator. Vladimir Putin, not a great friend of mine.

Key Findings:

Senator Bernie Sanders has a commanding nineteen point in the Nevada caucus, with 35 percent of likely caucusgoers supporting him. He is followed by Senator Elizabeth Warren, former Mayor Pete Buttigieg and Former Vice President Joe Biden who are all tightly clustered at 16, 15 and 14 percentage points, respectively.

Senator Amy Klobuchar, whose third place finish in the New Hampshire primary garnered considerable media coverage sits in sixth place with 9 percent of likely caucusgoers supporting her.

Sanders performs extremely well with Hispanic likely caucusgoers, registering 66 percent support, with no other candidate cracking double digits. He continues to see strong support among younger voters, with likely caucusgoers under 45 supporting him at 64 percent. Of those who have made up their mind, Sanders registers 47 percent support.

Democratic voters strongly support both Medicare for All (69 percent in support, 23 percent opposed) and a Green New Deal (93 percent in support, 6 percent opposed).

LAS VEGAS — Bernie Sanders is becoming harder to stop. Nevada is where his opponents are starting to realize it.

Advisers to three rival campaigns privately conceded over the weekend that the best anyone else could hope for here is second or third. Some of them gape at the crowd sizes at Sanders' events — like the swarm of supporters who accompanied Sanders, his fist raised, to an early caucus site in Las Vegas on Saturday, the first day of early voting in the state.

While few expect that Sanders can carry more than a third of the vote in Nevada, nearly everyone believes that will be enough to win in a field where the moderate vote remains splintered. It is becoming a source of celebration for Sanders' supporters and an urgent problem for those who want to prevent him from claiming the nomination.

“He’s going to win with 28 percent of the vote. We’re not talking about him getting 50 percent of the vote,” said Andres Ramirez, a Nevada-based Democratic strategist and former vice chairman of the Democratic National Committee’s Hispanic Caucus. “But the rest of the field is so fragmented, and he has his base locked, that he can continue winning just by holding onto his base.”